Localization / Translation : Error “Empty PO data”?

hello, all;
not sure if this is a problem of BuddyPress or Loco, but
all of a sudden, BuddyPress can’t be translated using Loco anymore;

attempting to open the language via /wp-admin/admin.php?path=languages%2Fplugins%2Fbuddypress-{lang}.po&bundle=buddypress%2Fbp-loader.php&domain=buddypress&page=loco-plugin&action=file-edit results in “Error | Empty PO data”. :/ I’m fairly confident this worked earlier (as I’ve done some translating per loco already).
This happens with any other language file as well.

WordPress version is 4.9.2, running Jannah 2.0 Theme,
BuddyPress version is 2.9.3
Loco Translate is version 2.0.17